1/*
2 * brmonitor.c		"bridge monitor"
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:	Stephen Hemminger <shemminger@vyatta.com>
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <time.h>
17#include <sys/socket.h>
18#include <sys/time.h>
19#include <net/if.h>
20#include <netinet/in.h>
21#include <linux/if_bridge.h>
22#include <linux/neighbour.h>
23#include <string.h>
24
25#include "utils.h"
26#include "br_common.h"
27
28
29static void usage(void) __attribute__((noreturn));
30int prefix_banner;
31
32static void usage(void)
33{
34	fprintf(stderr, "Usage: bridge monitor [file | link | fdb | mdb | all]\n");
35	exit(-1);
36}
37
38static int accept_msg(const struct sockaddr_nl *who,
39		      struct rtnl_ctrl_data *ctrl,
40		      struct nlmsghdr *n, void *arg)
41{
42	FILE *fp = arg;
43
44	if (timestamp)
45		print_timestamp(fp);
46
47	switch (n->nlmsg_type) {
48	case RTM_NEWLINK:
49	case RTM_DELLINK:
50		if (prefix_banner)
51			fprintf(fp, "[LINK]");
52
53		return print_linkinfo(who, n, arg);
54
55	case RTM_NEWNEIGH:
56	case RTM_DELNEIGH:
57		if (prefix_banner)
58			fprintf(fp, "[NEIGH]");
59		return print_fdb(who, n, arg);
60
61	case RTM_NEWMDB:
62	case RTM_DELMDB:
63		if (prefix_banner)
64			fprintf(fp, "[MDB]");
65		return print_mdb(who, n, arg);
66
67	case NLMSG_TSTAMP:
68		print_nlmsg_timestamp(fp, n);
69		return 0;
70
71	default:
72		return 0;
73	}
74}
75
76int do_monitor(int argc, char **argv)
77{
78	char *file = NULL;
79	unsigned groups = ~RTMGRP_TC;
80	int llink=0;
81	int lneigh=0;
82	int lmdb=0;
83
84	rtnl_close(&rth);
85
86	while (argc > 0) {
87		if (matches(*argv, "file") == 0) {
88			NEXT_ARG();
89			file = *argv;
90		} else if (matches(*argv, "link") == 0) {
91			llink=1;
92			groups = 0;
93		} else if (matches(*argv, "fdb") == 0) {
94			lneigh = 1;
95			groups = 0;
96		} else if (matches(*argv, "mdb") == 0) {
97			lmdb = 1;
98			groups = 0;
99		} else if (strcmp(*argv, "all") == 0) {
100			groups = ~RTMGRP_TC;
101			prefix_banner=1;
102		} else if (matches(*argv, "help") == 0) {
103			usage();
104		} else {
105			fprintf(stderr, "Argument \"%s\" is unknown, try \"bridge monitor help\".\n", *argv);
106			exit(-1);
107		}
108		argc--;	argv++;
109	}
110
111	if (llink)
112		groups |= nl_mgrp(RTNLGRP_LINK);
113
114	if (lneigh) {
115		groups |= nl_mgrp(RTNLGRP_NEIGH);
116	}
117
118	if (lmdb) {
119		groups |= nl_mgrp(RTNLGRP_MDB);
120	}
121
122	if (file) {
123		FILE *fp;
124		int err;
125		fp = fopen(file, "r");
126		if (fp == NULL) {
127			perror("Cannot fopen");
128			exit(-1);
129		}
130		err = rtnl_from_file(fp, accept_msg, stdout);
131		fclose(fp);
132		return err;
133	}
134
135	if (rtnl_open(&rth, groups) < 0)
136		exit(1);
137	ll_init_map(&rth);
138
139	if (rtnl_listen(&rth, accept_msg, stdout) < 0)
140		exit(2);
141
142	return 0;
143}
144
145